Back-draft-preventing chimney-cowl



M. CIACCIA.

BACK DRAFT PREVENTING CHIMNEY COWL.

APPLICATION FILED OCT. 29. 1919.

1,343,763. Patented June 15, 1920.

30 FIG. 1. 2o

PAT ENT OFFICE.

MICHAEL crAooIA, or ALBANY, New YORK.

BACK-DRAFT-PREVENTING oHIMirnY-oown Specification of Letters Patent. Patented June 15, 1920.

Applieation filed October 29, 1919. Serial No. 334,283.

To all whom it may concern:

Be it known that 1, MICHAEL Cmoom, a citizen of the United States of America, residing at Albany, in the county of Albany and State of New York, have invented certain new and useful Improvements in Back- Draft-PreventingChimney-Cowls, of which the following is a specification.

The primary object of the invention is the provision of a chimney cowl or top adapted to provide ready outlet for the products of combustion from the chimney while preventing any back-draft caused by air currents from without, the structure possessing great simplicity andbeing easy and v inexpensivelto, manufacture.

A further object of the invention is to provide a chimney top formed of metal or tile having adjustablemeans whereby main outlets are provided either for a direct draft in the top of the device or at the sides thereof farthest from the direction of travel of prevailing winds for the locality in which the chimney is positioned.

A still further object of the invention is to provide an economical chimney top preventing an'y clown-drafts of the smoke or gases without interfering with the normal up-draft of the chimney, provision being made to accelerate the draft of the chimney during the passing ofthe products of combustion through the device.

VViththese general objects in view, the.

invention consists of the novel combination and arrangement of parts hereinafter fully described, illustrated in. the accompanying drawing and then claimed.

In the drawing forming a part of this application and in which like reference numerals designate corresponding parts throughout the several views, p

* Figure 1 is an elevational view of one side of the invention partially broken away with the top closed, r

Fig. 2 isa top plan view thereof;

Fig. 3 is an elevational view of anadjacent side ofthe invention from that shown in Fig. 1 and withithe top lids open and t upon the top of a chimney 11 for receiving the products of combustion from the flue 12 thereof. The invention includes a casing 13 rectangular in cross section having the upper portion 14 thereof flaring downwardly meeting a lower portion 15 which tapers downwardly, the point of meeting of the sections 14 and 15 forming a waist 16 while a lower tubular extension 17 of the section 15 is mounted in the chimney flue 12.

The lower section 15 is provided with opposite openings 18 in two of its sides while the section 14 has slightly'larger' openings 19 in its corresponding sides above the plane of the openings 18. Hinged lids 20 of any suitable form are provided for the open top of the cowl, one manner of carrying out the invention belng the provision of two lids 20 hinged to the opposite edges 21 of the side walls of the cowl above the openings 19.

The lids 20 may be closed when it is desired to cut off the direct outlet for the vertical path oftravel of the products of combustion from the flue 12 although the lids 20 may be opened as illustrated in Fig. 3 of the drawing for flatly engaging the opposite sides of the cowl above theplane of the openings 19 and thereby forming a direct vertical passage through the device. It will.

'be understood that in the place of hinged lids 20 my invention also contemplatesthe placing of a removable plate or tile over the titions 25 are. similarly provided within the cowl between the sides 23 thereof being connected to thecowl substantially atthe line of iointure. 26 of the section 15 and neck 17. It will be seen that theupper partitions 22 extend above the plane of the side. openings 19 forming a contracted neck or throat 27 between the upper ends of the partitions 22 while the partitions 25 terminate above the planeof the openings 18 providing a contracted throat 27' between the upper ends of the partitions 25 substantially equal in size to the throat 27 and axially arranged with rewill be fully understood from this detailed description thereof; l/Vhe'n the lids 20 are thrown backto their open positions as illustrated by dotted lines in Fig. l, a direct ver 'tical up-draft is providedthrough the cowl from the flue 12,-the products of combustion passing through the contracted throats 27 and '27 outwardly of the top of the chimney; Air. may freely enter through the openings 18 and 19 into the back-draft .pre-

venting pockets 29 and .30 formed res'pectively outwardly of the partitions25 and 22,

thereby increasing the velocity of the updraft through the cowl by. preventing any pocketing or holding efi'ectupon the outgoing products of combustion by the cowl structure. lVhen the top draft is not desirable in the particular location. of the V chimney 1 1, the lids 20 are closed and the products of combustion pass through the contracted throats 27' and 27 outwardly through the side openings 25L. When the shields 28 are obliquely -m'ounted over the openings 24:,

the wind is prevented from blowing into the openings 24 but as-the shields 28 may be removed at will, the sides23 in which'the openings 2lnare positioned are arranged out of the direct line. of travel. of the prevailing winds, of that locality.

In the event of the products of combustion, smoke and gases from the flue 12 being blown backwardly in the cowl, the same may readily escape from theback-draft pockets through the openings 18 and 19 and in theevent that it becomes desirable to do so, both the top of the cowl as well-as the openings 2a might be closed for greatly reducing or choking the uprdraft of the flue 12 but still maintainingan open .passage through the cowl outletting at the openings-1'8 and 19. i s I V Whilethe form of my invention herein set forth-and described is believed to be the preferable embodiment thereof, it is neverthe= lessjto bejunderstood that minor changes maybe made therein in proportion, form and details of construction without departing fromthe spirit and scope of'the invention as claimed;

My invention is also serviceable for ventilating purposes, the hoods 28 'beingreadily Suitable lids or shields 28 are chimney.

removable by releasing the hinge'hooks 28' thereof. An adjustable plate 20 is at all times maintained centrally upon the top of the casing 13 directly above the throat 27, preventing snow and rain from entering the throat when the lids 20 are open.

What I claim'as new is Y 1. A device of the class described comprising a casing having a flaring waist portion, with openings in two of its. opposite sides above: and below saidwaist portion, means for mounting the casing in the top of a chimney and inclined partitions within the casing inwardly of said side openings forming contracted necks at the inner free ends of the partitions within the path of travel of products of combustion from the 1 2. A device of'the class describedcompris ing a casing-having aflaring waist portion, withfopenings in two of its opposite sides above. and below said waist portion, means for mounting the casing 1n the top of a chimney, inclined partitions withinthe casing inwardly of said side openings forming contracted necks atthe inner free ends of the partitions within the path of travel of productsof combustion from the chimney, the sides of the casing unprovided with said openings having outlet openings adjacent the. uppermost throat and adjustable closing means. for the top of the casing.

3. A chimney coWl comprising a casing having an enlarged waist line dividing the.

cowl into upper and lower sections, with said sections having openings therem posltloned above each other IH'OPpOSItB walls of the casing, inwardly and upwardly inclined partitions within the casing. with their lower ends mounted adjacent the waistline thereof forming opposite pockets inwardly ot' the upper ones of saidv openings, similar inwardly projecting partitions within the casing mounted adjacent the lower end of the lower section forming pockets inwardly of the lower openings, the said pairs of partitions forming contracted throats within the casing inthe path of travel of products of combustion therethrough.

4. A chimney cowl comprising a. casing having an enlarged waist line dividing the cowl into upper and. loweri'sections, with said sections having openings th'ereinpositioned above each other in opposite.walls of the casing, inwardlyand'upwardly inclined partitions within the casing with their lower ends mounted adj acent the 'waist line there- @of forming opposite pockets inwardly of the upper ones of said 'openlngs, snn lar 1nwardly projecting partitions withinfthe cas ing mounted adjacent the lower end of the lower section forming pockets inwardly of the'loweropenings, the said pairs of partitions forming contracted throats within the casing in the path of travel. of products of combustion therethrough, a neck carried by the lower end of the lower section adapted for seating within a chimney flue, the opposite sides of the upper section of the cowl which are unprovided with said openings having outlet openings adjacent the upper ends of the partitions of the upper section and adjustable closure means for the open top of the cowl.

5. A chimney cowl comprising a casing having an enlarged waist line dividing the cowl into upper and lower sections, with said sections having openings therein positioned above each other in opposite walls of the casing, inwardly and upwardly inclined partitions within the casing with their lower ends mounted adjacent the waist line thereof forming opposite pockets inwardly of the upper ones of said openings, similar in wardly projecting partitions within the casing mounted adjacent the lower end of the lower section forming pockets inwardly of the lower openings, the said pairs of partitions forming contracted throats within the casing in the path of travel of products of combustion therethrough, a neck carried by the lower end of the lower section adapted for seating within a chimney flue, the opposite sides of the upper section of the cowl which are unprovided with said openings having outlet openings adjacent the upper ends of the partitions of theupper section, adjustable closure means for the open top of the cowl, removable hoods for the said outlet openings carried by the op posite sides of the upper section whereby the outlet openings or the open top of the upper section are adapted for exhausting the products of combustion therethrough at will.

In testimony whereof I affix my signature.

MICHAEL CIACOIA. 

